The joint space between the femoral head and the superior acetabulum is normally between 2 and 7 mm. Its inferior notch is bridged by transverse acetabular ligament. The acetabular labrum is horse-shoe shaped. Instead, it is lined with fat pad and attached to ligamentum teres. The centre of the acetabulum (fovea) does not articulate to anything. The acetabulum grasps almost half the femoral ball, a grip deepened by a ring-shaped fibrocartilaginous lip, the acetabular labrum, which extends the joint beyond the equator. It is a special type of spheroidal or ball and socket joint where the roughly spherical femoral head is largely contained within the acetabulum and has an average radius of curvature of 2.5 cm. The Y-shaped growth plate that separates them, the triradiate cartilage, is fused definitively at ages 14–16. The cuplike acetabulum forms at the union of three pelvic bones - the ilium, pubis, and ischium. Both joint surfaces are covered with a strong but lubricated layer called articular hyaline cartilage. It forms the primary connection between the bones of the lower limb and the axial skeleton of the trunk and pelvis. The socket is also turned such that the outer edge of its roof is more lateral than outer edge of the floor. The socket of the acetabulum is pointing downwards and anterolaterally. The hip joint is a ball and socket synovial joint formed by the articulation of the rounded head of the femur and the cup-like acetabulum of the pelvis. Articulation Radiograph of a healthy human hip joint The proximal femur is largely covered by muscles and, as a consequence, the greater trochanter is often the only palpable bony structure in the hip region. It allows for a wide range of movement and stability in the lower body. The hip joint, also known as a ball and socket joint, is formed by the acetabulum of the pelvis and the femoral head, which is the top portion of the thigh bone (femur). Pain of the hip may be the result of numerous causes, including nervous, osteoarthritic, infectious, traumatic, and genetic. The hip joints have very important roles in retaining balance, and for maintaining the pelvic inclination angle. coxae), is the joint between the head of the femur and acetabulum of the pelvis and its primary function is to support the weight of the body in both static (e.g., standing) and dynamic (e.g., walking or running) postures. The hip joint, scientifically referred to as the acetabulofemoral joint ( art. In adults, three of the bones of the pelvis have fused into the hip bone or acetabulum which forms part of the hip region. The hip region is located lateral and anterior to the gluteal region, inferior to the iliac crest, and overlying the greater trochanter of the femur, or "thigh bone". In vertebrate anatomy, hip (or coxa in medical terminology pl.: coxae) refers to either an anatomical region or a joint.
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